John t



(No Model.)

J. Y. DAVIS.

AUTOMATIC GAR BRAKE.

No.36'7,791 Patnted,A u'g'.'9, 1887.

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WITNESSES: INK/EDITOR:

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UNITED STATES PATENT- OFFICE.

JOHN Y. DAVIS, OF UNION SPRINGS, NEWV YORK.

AUTOMATIC CAR -'5 RAKE.

SPECIFICATION forming part of Letters Patent No. 367,791, dated A g Application filed February 26, 1885. Serial No. 157.096. (No model.)

To all whom it may concern:

Be it known that 1, JOHN Y. DAVIS, a citizen of the United States, residing at Union Springs, in the county of Cayuga and State improvements are to causethe application or I release of the brakes of a railway-car automatically by means of the momentum of the .ear or its resistance to the force applied at either draw-head. I attain these objects by the mechanism illustrated in the accompanyging drawings, in which- Figure 1 is a side view of a railway-truck withthe device applied. Fig. 2 .is an end view of same. Fig.3 is a vertical section of the device on the line :0 3 of Fig. 4. Fig. 4 is a top or planview; and Fig. 5 is a view of a modification in the manner of connecting the draw-heads together.

. Similar letters refer to similar parts throughout the several views.

A A represent the two draw-heads attached to the two extremities of the car. These drawhcads are connected in such a manner by means of a rigid draw-bar or its equivalent,

as shown at B B, as to cause the horizontal movement of one draw-head. to produce a like horizontal movement in the other, or pulling one will be the same as pushing the other, 'or pushing one will be the same as pulling the other. This object may be attained in various ways, one of which is shown in Fig. l and another in Fig. 5,-which will be described hereinafter.

S S are the brake shoes, attached to the two extremities'of the horizontal brake-beams K,

to the center of the length of which are attached the vertical brake-levers F,connected;

at their lower extremities by the horizontal connecting-bar H, and provided at their upper extremities with the anti-friction rollers E E. The brake-sh0es are swung from theframe of the car or truck by means of the links L, and are also allowed a vertical movement by having the upper ends of thelinks connected with the frame of the car or truck by means of a longitudinal loopor slot, as shown at N, Figs.

1 and 2, or having the lower-ends of thelinks connected to the shoes in the same way.

0 G are two projections attached to the upper side of the rigid draw-bar B in such a position that they will come into contact with and push the rollers E E whenever, by the movement of the draw-heads A A and their connecting-bar H, they are given that direc tion, providing the rollers are made to take the position in front of the projections by the vertical movements of the shoes S S, to which they are connected by means of the lovers F and brake-beams K.

D D are stationary stops with which the rollers E will come into contact whenever the opposite roller is moved forward by the projection (l.

In Fig. 5, A A are the opposite drawheads, I

attached at their inner ends to the center of equalizing-levers X X, which are pivoted to the frame of the car atY and connected at their extremities by the connecting-rods H.

It will be seen that this device connects the 'two draw-heads so as to give them a simultaneous movement in the same direction, thesame as though they were attached to the ex tremitics of the rigid draw-bar.

The operation of the device may be described as follows: \Vhenever any force is applied. to push the rear draw-head orto pull the front one the car will take the same direction and cause the shoes and connections to take the corresponding direction whenever the shoes are in contact with the wheels, unless stoppedby the links L coming into contact with one end of the loops at their ends.

As will be'seen, the arrangement is such that the rollers E are carried from in front of the projections 0 whenever the projections O are thrust forward in the same direction as that in which the car is moving, and so releases the brakes, aud that they will be kept in front of the projections whenever they are thrust in the opposite direction from that in which the car is moving, and so apply the brakes by the vertical movement of the brakeshoes to which the rollers E are connected, this vertical movement being given the shoes by their coming into contact with the rims of the wheels, against which they are pushed by the pressure of the projectionsO against the rollers E.

too

Vhenever either of the rollers E is pushed forward by the action of the projections O, the shoes S, with which they are connected, are pushed against the rims of their wheels, and serving as a fulcrum cause the lower end of the lever F to push the opposite shoes against their wheels, the roller at the top of the opposite lever coming into contact with the stationary stop D.

Itbeing plain thatthe act of pushing against the front draw-bar or pulling the rear one being the same in this device, the resistance to the momentum of the moving car causes the draw-hcads to move in the opposite direction to that of the car,and by the operation of this device applies the brakes; also, pressing against the rear draw-bar being the same as pulling the front one, the resistance of the ear to any force applied to either drawhead causes them to move in the same direction as that of the ear and by the operation of this device releases the brakes. Thereforcany external foreensed to resist the momentum of the car applies the brakes, and any external force applied to overcome the resistance of the car will release the brakes, providing that external force is applied through the drawheads; bntif, after the ear is stopped with the brakes set, it is desired to start it again in the opposite direction the draw-head which was the front one will be come the rear one and the external force ap plied will be an active force instead of a passive one, and the position of the several parts must adjust themselves to meet the opposite of their release; or a complete automatic momentu 1n brake must meet both requirements, that of applying an external force in such a manner as to cause the momentum of the car to apply the brakes and the resistance of the same to release the brakes and also to cause the several parts to adjust themselves to a reversal of the direction in which the car had been moving. as has been shown, is met by connecting the draw-heads A in such a manner that they will both move in the same direction when any force is applied to either; and the second requiremcnt is met by so attaching the shoes to the frame of the car or truck as that they may be moved in the same direction as the rims of the wheels with which they are in contact when the brakes are set, and by their connections to cause the relations of the parts to change, or to allow of their being changed by the reversal of the direction of the wheels.

Having described my invention, what I claim, and desire to secure by Letters Patent,

1. The combination of the car, the drawhcads having fixed connections with each other, and the brake-shoes connected to the drawheads and to the frame and susceptible of moving with the rims of the wheels, substantially as described, whereby any force applied to either draw-head to resist the momentum of the car will apply the brakes and any force applied to either draw-head to overcome the resistance of the car will release the same, as set forth.

2. The draw-bars having the projections C C, in combination with thelevers l actuated by the brake-shoes, links L, and brake-beam K, substantially described.

3. The combination of the levers F, bar II, draw-bar, stationary stops 1), and projections C, substantially as described.

JOIIN Y. DAVIS.

Vitnesscs:

IsAJniLLA G. DAYTS, Ciril'miris F. DAVIS.

The first of these requi remcnts, 

